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However, currently, the electrochemical sensors for formaldehyde are substantially limited on the market due to the long\u2010term unsolved problems of the low electrooxidation efficiency and CO poisoning issue of commercial Pd catalysts. Here, a 2D Cr\u2010doped Pd metallene (Cr\u2010Pdene) with few atomic layers is shown as an advanced catalyst for ultrasensitive and selective sensing of formaldehyde via a highly efficient formaldehyde electrooxidation. It is found that the doping of Cr into Pd metallene can efficiently optimize the electronic structure of Pd and weaken the interaction between Pd and CO, providing an anti\u2010poisoning means to favor CO<jats:sub>2<\/jats:sub> production and suppress CO adsorption. The Cr\u2010Pdene\u2010based electrochemical sensor exhibits one order of magnitude higher detection range and, especially, much higher anti\u2010interference for formaldehyde than that of the conventional sensors. Most importantly, it is demonstrated that the Cr\u2010Pdene can be integrated into commercializable wireless sensor networks or handheld instruments for promising applications relating to the environment, health, and food.<\/jats:p>","DOI":"10.1002\/adma.202105276","type":"journal-article","created":{"date-parts":[[2021,11,5]],"date-time":"2021-11-05T10:39:06Z","timestamp":1636108746000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":93,"title":["Cr\u2010Doped Pd Metallene Endows a Practical Formaldehyde Sensor New Limit and High Selectivity"],"prefix":"10.1002","volume":"34","author":[{"given":"Jingxian","family":"Zhang","sequence":"first","affiliation":[{"name":"CAS Key Laboratory of Green Process Engineering Institute of Process Engineering Chinese Academy of Sciences  Beijing 100190 P. R. 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